Authorities said Ryan Patrick Matthias, 43, of Charlotte, N.C., is being held in the killing of Deborah Castellano, 47, who was shot in her car on Basket Ring Road in Columbia on May 4.

Castellano recently moved to the area from New York, police said.

Police received a 911 call around 9 a.m. from a person who reported seeing a woman who appeared to be injured in a car parked in the 9600 block of Basket Ring Road. Officers arrived and found Castellano, who lived at that address, dead in a Toyota Corolla in the parking lot. She had been shot multiple times.

Investigators said they learned Castellano had recently been harassed by Matthias, who was her ex-boyfriend. Detectives learned that the pair was arrested in New York in March for a domestic violence incident.

Since then, Castellano had ended the relationship and moved to Maryland, but Matthias continued to harass and stalk her, police said.

Castellano had not reported the harassment to police in Howard County. After the homicide, family members told police they had been concerned for her safety.

Detectives confirmed that Matthias had rented a car in North Carolina the day before the murder on May 3. The car was returned May 5 with more than 1,000 miles logged on the vehicle.

Investigators said they gathered additional information that led them to confirm Matthias as the suspect and a warrant was issued for his arrest.

Matthias was taken into custody by Charlotte-Mecklenburg police in North Carolina on Saturday. He is being held on a detainer until he is extradited to Maryland to face charges.